The pelvic skeleton connecting the spine and lower limbs is a complete bone ring composed of the posterior sacrum and coccyx (the two lowest bones in the spine) and the left and right hip bones. The pelvis not only transfers the weight to the two lower limbs, but also serves as the basis for free lower limb movement, supporting and protecting the organs in the abdominal basin.

The whole pelvis is divided into upper large pelvis (false pelvis) and lower small pelvis (true pelvis) by dividing line. The boundary line is an annular line surrounded by the sacral promontory, the front edges of the sacral wings on both sides, the arched lines on both sides, the pubic comb, pubic tubercle, pubic crest and the upper edge of pubic symphysis on both sides.

That is, the upper mouth of the small pelvis, through which the large and small pelvis communicate. The inferior orifice of the small pelvis is uneven, and it is composed of coccygeal tip and sacral tubercle ligament, ischial tubercle, pubic arch and the lower edge of bilateral pubic symphysis, which is rhombic. The part between the upper mouth and the lower mouth is the pelvic cavity.

Extended data

Brain: the regulatory center and nerve center of the human body.

Lung: gas exchange between human body and the outside world.

Heart: it promotes blood flow, provides sufficient blood flow for organs and tissues, supplies oxygen and various nutrients, and takes them away.

The final products of Xie (such as carbon dioxide, urea, uric acid) make the cells maintain normal metabolism and function.

Stomach: It is mainly used to grind large pieces of food into small pieces (also called physical digestion) and degrade macromolecules in food into smaller molecules (also called chemical digestion) for further absorption.

Skin: the largest organ of the human body, which mainly undertakes the functions of protecting the body, sweating, feeling cold and heat and stress.

Liver: It can biotransform many non-nutritive substances from inside and outside the body, such as various drugs, poisons and some metabolites in the body.

Reference source

Baidu encyclopedia-pelvis